GO/CNC/PVA复合水凝胶制备与性能

Preparation and properties of GO/CNC/PVA composite hydrogels

为了制备良好力学性能和导电性能的水凝胶,以聚乙烯醇(PVA)为基体材料,以氧化石墨烯(GO)和纤维素纳米晶(CNC)为填充材料,甘油和二甲基亚砜为有机溶剂,制备GO/CNC/PVA复合水凝胶,研究氧化石墨烯含量对复合水凝胶机械性能和导电性能的影响。对GO/CNC/PVA复合水凝胶机械性能、自恢复性能、应变传感性能和微观结构进行表征测试。结果显示:加入氧化石墨烯对水凝胶的机械性能有正向影响,增加氧化石墨烯含量,GO/CNC/PVA复合水凝胶弹性模量增加,刚性增强,物理韧性增强,具有良好的自恢复性能,且电阻变化率提高,具有良好的电传感性能;当CNC含量不变,氧化石墨烯含量为0.1 g时,GO/CNC/PVA复合水凝胶的电导率为0.083 S/m;氧化石墨烯含量为0.15 g时,GO/CNC/PVA复合水凝胶的弹性模量最大为370 kPa,拉伸断裂应力为500 kPa。

In order to prepare hydrogels with good mechanical and electrical properties,GO/CNC/PVA composite hydrogels were prepared by using polyvinyl alcohol(PVA)as the matrix material,graphene oxide(GO)and cellulose nanocrystalline(CNC)as the filling material,glycerol and dimethyl sulfoxide as the organic solvent.The effect of GO on the conductivity and mechanical properties of hydrogels was studied by controlling the content of GO.The mechanical properties,self recovery properties,strain sensing properties and microstructure of GO/CNC/PVA composite hydrogel were characterized and tested.The results showed that adding oxidation graphene has a positive effect on the mechanical properties of the hydrogel,increase content of graphene oxide,GO/CNC/PVA composite hydrogel elastic modulus increase,enhance the rigidity,physical toughness enhancement,it has good self-recovery performance.Compared with the samples without GO,the change rate of resistance was higher,which proved that the samples had good sensing performance.When the GO content is 0.1 g,the conductivity of GO/CNC/PVA composite hydrogel is 0.083 S/m.The elastic modulus and tensile fracture stress of GO/CNC/PVA hydrogel were 370 kPa and 500 kPa respectively when the GO content was 0.15 g.